About Earth Hour

How long until Earth Hour?
Earth Hour .
Dates of Earth Hour
2025 InternationalMar 29
International Sat, Mar 29Observances Holiday
2024 InternationalMar 30
International Sat, Mar 30Observances Holiday
2023 InternationalMar 25
International Sat, Mar 25Observances Holiday
2022 InternationalMar 26
International Sat, Mar 26Observances Holiday
2021 InternationalMar 27
International Sat, Mar 27Observances Holiday
Summary
Find out the dates, history and traditions of Earth Hour.

Every year, at 8:30 pm on the last Saturday of March, millions of people across the world join in raising awareness of the issues facing our planet.

Started by the World Wildlife Fund (WWF) and partners as a symbolic lights-out event in Sydney in 2007, Earth Hour is now one of the world's largest grassroots movements for the environment.

Each year, Earth Hour engages millions of people in more than 180 countries and territories, switching off their lights to show support for our planet. 

But Earth Hour goes far beyond the symbolic action of switching off - it has become a catalyst for positive environmental impact, driving major legislative changes by harnessing the power of the people and collective action.

Earth Hour is open-source and everyone, anyone, is welcome to take part and help amplify our mission to unite people to protect our planet. 

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